1. Equipoise, knowledge, and ethics in clinical research and practice;Ashcroft;Bioethics,1999
2. The architecture of reason;Audi,2001
3. Black’s Law Dictionary (1999) (7th ed.). St. Paul, MN: West Group.
4. Brombacher, M. (1999). The precautionary principle threatens to replace science. Pollution Engineering (Summer), 32–34.
5. Learning for the law to address uncertainty in the precautionary principle;Cranor;Science and Engineering Ethics,2001